Lock-nut.



1'. PINTO.

LOCK NUT.

Patented May 4, 1915.

LBSAQ.

UNITED STATES PATENT QFFICE.

JOSEBI-I PINTO, OSCEOLA MILLS, PENNSYLVANIA..

LOCK-NUT.

masa-oa.

Application filed September 24, 1914.

[ all fwlwm it may concern.'

Be it known that I, eIosnrH PINTO, a citi- Zen of the United States,residing at Osceola Mills, in. the county of Clearfield and State ofPennsylvania, have invented certain new and useful Improvements inLock-Nuts, of which the following is a specification.

My invention relates to securing devices,

particularly for bolts and nuts, and has for its object the provision ofnovel means whereby a nut may be locked upon a bolt for preventingaccidental removal therefrom.

An important object is the provision of a device of this character' inwhich a nut may be screwed upon a. bolt but which may not be unscrewedtherefrom unless the locking means carried thereby is released by theoperator.

A further Objectis the provision of a. nut lock which will be simple andinexpensive to iminufacture, eiticient and positive in action, and ageneral improvement of the art.

' l/Vith these and other objects and advantages in view, my inventionconsists in the novel construction and arrangement to be hereinaftermore fully described and claimed, and illustrated in the accompanyingdrawings, in which,

Figure 1 is a view of a nut having my improved locking means therein,the nut being shown applied to a bolt, parts being broken away insection, and, Fig. 2 is a similar view, showing the locking meansreleased so that the nut may be unscrewed.

Referring more particularly to the drawings, the numeral 5 designates abolt, to which my improved nut is adapted to be applied. The nut 6 isprovided with a hole or passage 7, which extends preferably from onecorner of the nut and has its outer side tangent to the bolt 5, thepassage 7 extendn ing into the screw-threaded opening of the nut. A pinS is secured in the nut 6 and extends transversely across one end of thepassage 7.

In order to lock the nut upon the bolt I provide a latch member 9,within the passage 7. One end of the latch member 9 is rounded, as shownat 10, and normally rests against the transverse pin 8, and the 4otherend is inclined to form a tooth 11. A leafspring 12 is disposed withinthe passage 7 having its ends bearing against the outer side thereof andits bowed portion engaging said latch member 9 for holding it in en-Speccaton of Letters Patent.

Patented May 4:, 1915.

Serial No. 863,254.

gagement with the inner face of the passage, as shown in Fig. 1.

The parts being in the position shown in Fig. 1, when it is desired toscrew the nut 6 upon the bolt 5, the nut is rotated in the direction ofthe arrow, whereupon the movement of the nut will be unimpeded, as theengagement of the tooth 11 with the threads of the bolt will cause thelatch member 9 to move outward slightly against the resistance of thespring 12, thus allowing the tooth 11 to ride idly over the threads. If,however, any attempt is made to move the nut 6 in the opposite directionfor unscrewing it from the bolt, the latch member 9 will bear againstthe inner face of the passage .7 and the sharp edge of the tooth 11 willthen bite into the threads of the bolt, thereby preventing the removalof the nut from the bolt.

When it is desired, however, to remove the nut, I provide means forreleasing the tooth 11 from engagement with the threads of the bolt sothat the nut may be turned. To this end I provide an opening 13 in thenut extending into the passage 7 adjacent the inner end of the latchmember 9. When it is desired to unscrew the nut I insert a rod 14through the opening 13 and press the inner end of the latch member 9outwardly against the resistance of the spring 12, as shown in Fig. 2,whereupon the latch member will swing at the point where its rounded end10 abuts against the pin 8, thus causing the tooth 11 to swing outwardlyentirely out of contact with the threads of the bolt.

From the foregoing description and a study of the drawing it will beapparent that I have thus provided a nut which may be easily and quicklyscrewed upon a bolt and which is incapable of accidental displacementthereon and which may yet be quickly removed therefrom at the will ofthe operator.

It will be readily understood that I may make various changes in theform, construction, arrangement and location of parts, without departingfrom the spirit of the invention asl defined by the subjoined claim.

I-Iaving thus described my invention, what I claim is :-v

In combination with a bolt, a lock nut comprising a nut threaded uponthe bolt and provided with a recess communicating with the bore of thenut and tangential to catch member against the opposite Walll thereof,and a tooth formed on said catch member and normally contacting With thethreads on said bolt, whereby movement of said nut for screwing it uponsaid bolt will cause movement of said catch member in opposition to saidleaf spring and whereby movement of said 15 nut for unscrewing it fromsaid bolt will cause said tooth to bite into said thread.

In testimony whereof I have affixed my signature in presence of twoWitnesses.

JOSEPH PINTO.

Vitnesses `JOHN PINTO,

F. H. MCCULLY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

